/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package org.wdm.utils;

import org.wdm.beans.points.Point;

/**
 *
 * @author thanasis
 */
public class Utils {
    public static double distance(Point from, Point to, String unit) {
        double lat1 = from.getLatitude();
        double lon1 = from.getLongitude();
        double lat2 = to.getLatitude();
        double lon2 = to.getLongitude();
        
        double theta = lon1 - lon2;
        double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta));
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60 * 1.1515;
        if (unit.equals("K")) {
            dist = dist * 1.609344;
        } else if (unit.equals("N")) {
            dist = dist * 0.8684;
        }
        return (dist);
    }
    
    
    public static double distance(double lat1, double lon1, double lat2, double lon2, String unit) {
        double theta = lon1 - lon2;
        double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta));
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60 * 1.1515;
        if (unit.equals("K")) {
            dist = dist * 1.609344;
        } else if (unit.equals("N")) {
            dist = dist * 0.8684;
        }
        return (dist);
    }

    private static double deg2rad(double deg) {
        return (deg * Math.PI / 180.0);
    }

    private static double rad2deg(double rad) {
        return (rad * 180.0 / Math.PI);
    }
}
